參數(shù)資料
型號(hào)： MAX3140EEI+T
廠商： Maxim Integrated Products
文件頁(yè)數(shù)： 1/36頁(yè)
文件大?。?/td> 0K
描述： IC UART W/RS485 28-QSOP
產(chǎn)品培訓(xùn)模塊： Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標(biāo)準(zhǔn)包裝： 2,500
特點(diǎn)： 收發(fā)器
FIFO's： 8 字節(jié)
規(guī)程： RS232，RS485
電源電壓： 4.75 V ~ 5.25 V
帶IrDA 編碼器/解碼器： 是
帶故障啟動(dòng)位檢測(cè)功能： 是
帶CMOS： 是
安裝類型： 表面貼裝
封裝/外殼： 28-QSOP
供應(yīng)商設(shè)備封裝： 28-QSOP
包裝： 帶卷 (TR)
General Description
The MAX3140 is a complete universal asynchronous
receiver-transmitter (UART) and a true fail-safe RS-
485/RS-422 transceiver combined in a single 28-pin
QSOP package for space-, cost-, and power-con-
strained applications. The MAX3140 saves additional
board space as well as microcontroller (C) I/O pins by
featuring an SPI/QSPI/MICROWIRE-compatible
serial interface. It is pin-programmable for configuration
in all RS-485/RS-422 networks.
The MAX3140 includes a single RS-485/RS-422 driver
and receiver featuring true fail-safe circuitry, which
guarantees a logic-high receiver output when the
receiver inputs are open or shorted. This feature pro-
vides immunity to faults without requiring complex ter-
mination. The MAX3140 provides software-selectable
control of half- or full-duplex operation, data rate, slew
rate, and transmitter and receiver phase. The RS-485
driver slew rate is programmable to minimize EMI and
results in maximum data rates of 115kbps, 500kbps,
and 10Mbps. Independent transmitter/receiver phase
control enables software correction of twisted-pair
polarity reversal. A 1/8-unit-load receiver input imped-
ance allows up to 256 transceivers on the bus.
The MAX3140’s UART includes an oscillator circuit
derived from an external crystal, and a baud-rate gen-
erator with software-programmable divider ratios for all
common baud rates from 300 baud to 230k baud. The
UART features an 8-word-deep receive FIFO that mini-
mizes processor overhead and provides a flexible inter-
rupt with four maskable sources, including address
recognition on 9-bit networks. Two control lines are
included for hardware handshaking—one input and
one output.
The MAX3140 operates from a single +5V supply and
typically consumes only 645A with the receiver active.
Hardware-invoked shutdown reduces supply current to
only 20A. The UART and RS-485/RS-422 functions can
be used together or independently since the two func-
tions share only supply and ground connections (the
MAX3140 is hardware- and software-compatible with the
MAX3100 and MAX3089).
Applications
Industrial-Control
Transceivers for EMI-
Local Area Networks
Sensitive Applications
HVAC and Building Control
Embedded Systems
Point-of-Sale Devices
Intelligent Instrumentation
Features
o Integrated UART and RS-485/RS-422 Transceiver
in a Single 28-Pin QSOP
o SPI/MICROWIRE-Compatible Interface Saves C
I/O Pins
o True Fail-Safe Receiver Output Eliminates
Complex Network Termination
o Pin-Programmable RS-485/RS-422 Features
Half/Full-Duplex Operation
Slew-Rate Limiting for Reduced EMI
115kbps/500kbps/10Mbps Data Rates
Receiver/Transmitter Phase for Twisted-Pair
Polarity Reversal
o Full-Featured UART
Programmable Up to 230k baud with a
3.6864MHz Crystal
8-Word Receive FIFO Minimizes Processor
Overhead
9-Bit Address-Recognition Interrupt
o Allows Up to 256 Transceivers on the Bus
o Low 20A Hardware Shutdown Mode
o Hardware/Software-Compatible with MAX3100
and MAX3089
MAX3140
SPI/MICROWIRE-Compatible UART with Integrated
True Fail-Safe RS-485/RS-422 Transceivers
________________________________________________________________
Maxim Integrated Products
1
19-1453; Rev 1; 9/10
PART
MAX3140CEI+
MAX3140EEI+
-40°C to +85°C
0°C to +70°C
TEMP. RANGE
PIN-PACKAGE
28 QSOP
Ordering Information
SPI/QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
Pin Configuration appears at end of data sheet.
Typical Application Circuit
CS
SCLK
SPI/
MICRO-
WIRE
DIN
DOUT
P
UART
IRQ
H/F SRL
Rt
HALF/FULL-DUPLEX
RS-485/RS-422
Rt
TXP
CONTROL
LOGIC
RS-485
RS-422
RXP
MAX3140
+
Denotes a lead(Pb)-free/RoHS-compliant package.
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
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